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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

I am trying to get minecraft running for my son and I have a .jar that is an executable, when I right click on it and try to change the default application to open it with JRE is not listed. I only want this particular file to be opened with JRE. Any help would be appreciated.

I never figured out how to do what your asking with Debian Gnome but this works just as well if not better for me.

Make a .desktop file in ~/.local/share/applications with the following content, edited for your setup of course. This will add it to the "start menu" or whatever one wants to call it. Just like any installed app. A logout / log in may be required to get it to register as an installed application.